- overapi - Tons of quick reference sheets for various languages, frameworks, etc.
- Big-O Cheatsheet - Complexity for various data structure and algorithms. Probably useful for 281.
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Regular Expressions - Not the prettiest site but it's a good walkthrough of how regular expressions work and the highlighting makes it really clear
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RegExr - Mess around with regexes in your browser
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RegexOne - An interactive simple tutorial on regexes.
It's recommended to use a podcast app such as Castbox instead of going directly to each podcast's site. Refer to the Android and iOS pages for podcasts specific to those topics.